Photocatalytic Characteristics of Nano TiO2 Doped by Iron (III) and Nitrogen
Titanium dioxide powder co-doped by Fe 3+and N was prepared in sol-gel method with tetrabutyl titanate as raw material, iron(III) nitrate as source of ferrum, urea as source of nitrogen. The structure and properties of catalysts were characterized by XRD, XPS, DSC, FS, UV-Vis respectively, where XRD represents Fe/N-TiO2 species calcined at 500°C are classified into anatase pattern with average 17nm diameter of TiO2 crystal; XPS shows iron and nitrogen species dope into the lattice of TiO2 framework; DSC indicates phase transition temperature 440°C of the doped TiO2 from amphorous crystalline into anatase and the dopants have a limited effect on transition temperature; UV-Vis reveals stronger absorption of doped TiO2 than that of TiO2 in visible region and red shift of 70nm to 450nm; FS proves poorer electron-hole recombination. On basis of degradation of methylene blue, photocatalytic activities of various catalysts are investigated to identify maximum decolorization at 2g/L of the doped TiO2, i.e., 92% of decolorized efficiency at 2h ultraviolet illumination and 60% decolorized efficiency at 5h visible illumination.
Xianghua Liu, Zhengyi Jiang and Jingtao Han
M. Fu et al., "Photocatalytic Characteristics of Nano TiO2 Doped by Iron (III) and Nitrogen", Advanced Materials Research, Vols. 148-149, pp. 1623-1628, 2011